Isuzu N-Series. Manual - part 1162

8-360 CAB AND CHASSIS ELECTRICAL

Characteristic of fuel heater

Rear Heater Switch

Inspection
Check the continuity between the connector terminals
while operating the switch.
Replace the switch when the result of inspection is
found abnormal.

Rear Heater Motor

Inspection
Disconnect the rear heater connector.
Connect the battery positive terminal to the NO.3 termi-
nal of the rear heater motor side connector and negative
to the NO.2. Check to see if rear heater motor operates
low-speed correctly.
Connect the battery positive terminal to the NO.3 termi-
nal of the rear heater motor side connector and negative
to the NO.1. Check to see if rear heater motor operates
high-speed correctly.
Replace the rear heater motor when the result of inspec-
tion is found abnormal.

4WD Transfer (Vacuum Control)

General Description

The circuit consists of the starter switch, 4WD switch,
4WD detect switch, 4L switch, vacuum switching valve,
4WD indicator light, neutral switch and the relay.
When the 4WD switch is turned on to drive in the 4WD
mode, the vacuum switching valve for the transfer con-
trol is activated through the 4WD relay, and the transfer
shift rod connected to the vacuum actuator is shifted to
the 4WD side to turn on the 4WD detect switch. At the
same time, the indicator light in the meter lights on to tell
that the mode is transferred to 4WD mode.
However, when running in the normal mode (2WD), the
4WD switch is not operated. Accordingly, no current
flows through the 4WD vacuum switching valve for the
transfer control, with the 4WD detect switch left in the
“OFF” condition (2WD mode).

N8A5440E

N8A5438E

N8A5439E

CAB AND CHASSIS ELECTRICAL 8-361

Parts Location

N8A5441E

8-362 CAB AND CHASSIS ELECTRICAL

Circuit Diagram

X-24

X-24

J-44

J-43

H-8

J-42

J-42

B-93

B-93

B-93

J-42

J-42

B-93

B-93

X-24

X-24

H-8

H-8

OFF

ON

ACC

ST

B

B-67

B-67

B-7

J-9

P-1

P-2

P-3

P-4

P-5

2

3

5

8

6

7

3

9

1

15

2

3

4

1

1

4

5

2

10

2WD

4WD

FRAME

FL-1  100A

MAIN

2L

FL-2  40A

STARTER SWITCH

3W/B

3W/L

3B/Y

KEY SW

FUSE BLOCK

F-16  10A

METER

RELAY; TAIL (5)

0.5LG/R

0.5B/Y

0.5B/Y

0.5B/Y

0.5B/Y

4WD SWITCH

0.5GR/B

0.5GR/R

0.3GR/G

4WD INDICATOR LIGHT

(METER)

0.5GR/G

0.5B/Y

RELAY; 4WD

0.5B/R

0.85B/R

0

.5GR/R

0.85B

VSV:1 TRANSFER 

CONTROL (2WD)

VSV:2 TRANSFER

CONTROL (4WD)

4WD DETECTIVE SWITCH

  2WD=ON

  4WD=OFF

(         )

0.85B

2B

2B

2B

3B

3B

0.5B

0.3B

HEADLIGHT BRACKET (LH)

FRAME-LH (CENTER)

H-7

1

B-51

B-51

8

22

9

0.5GR/B

H-5

3

N8A5442E

CAB AND CHASSIS ELECTRICAL 8-363

Connector List

No.

Connector Face

B-51

B-67

B-67

B-93

X-24

J-42

J-42

J-43

014-001

1 2 3 4 5 6 7 8

9 1011121314

004-001

1

2

3

4

004-002

2
4

1
3

008-005

1

2

3

4

5

6

7

8

005-006

004-012

1

2

3

4

004-013

1

2

3

4

001-002

1

J-43

J-44

J-44

P-1

P-4

P-2

P-3

P-5

No.

Connector Face

001-003

1

001-002

1

001-003

1

000-004

000-004

000-006

000-006

000-002